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Yes, this would be valid service under SC rules of civil procedure, Rule 4:
(d)(8) Service by Certified Mail. Service of a summons and complaint upon a defendant of any class referred to in paragraph (1) or (3) of this subdivision of this rule may be made by the plaintiff or by any person authorized to serve process pursuant to Rule 4(c), including a sheriff or his deputy, by registered or certified mail, return receipt requested and delivery restricted to the addressee. Service is effective upon the date of delivery as shown on the return receipt. Service pursuant to this paragraph shall not be the basis for the entry of a default or a judgment by default unless the record contains a return receipt showing the acceptance by the defendant. Any such default or judgment by default shall be set aside pursuant to Rule 55(c) or Rule 60(b) if the defendant demonstrates to the court that the return receipt was signed by an unauthorized person. If delivery of the process is refused or is returned undelivered, service shall be made as otherwise provided by these rules.
If you do not pick it up he will have to send the sheriff to serve you personally. If the sheriff could not serve you then he would have to go to court and file for service by publication.